root
  └ (1) paragraph 

 selection: range  
  ├ anchor { key: 1, offset: 0, type: element }
  └ focus { key: 1, offset: 0, type: element }

 commands:
  └ 1. { type: FOCUS_COMMAND, payload: FocusEvent }
  └ 2. { type: SELECTION_CHANGE_COMMAND, payload: undefined }
  └ 3. { type: SELECTION_CHANGE_COMMAND, payload: undefined }

 editor (v0.18.0+dev.esm):
  └ namespace Playground
  └ editable true